anonymous one year ago .

1. anonymous

I was able to figure out how to graph the $f(x)=\sqrt{3x+2}$

2. anonymous

but the f^-1 is new to me

3. welshfella

ok you need to find x in terms of f(x) let f(x) = y y = sqrt(3x + 2) square borh sides y^2 = 3x + 2 can you continue?

4. anonymous

now , from what @welshfella did, try making x the subject formula

5. anonymous

I feel so dumb right now, but I'm really trying to understand.

6. welshfella

f-1(x) means the inverse of f(x) find x in terms of y:- 3x = y^2 - 2 x = (y^2 - 2) / 3 now replace x by f-1(x) and y by x f-1(x) = (x^2 - 2) / 3

7. anonymous

very correct @welshfella

8. anonymous

okay before I saw the answer at the bottom there I made up my mind that it had to be the third option I have in the picture, which I guess means I do understand it a little bit.

9. anonymous

Thanks so much @welshfella I'll have to keep reviewing this though

10. welshfella

yes and try a few examples try a simple one ;- f(x) = 4x Find f-1(x)

11. welshfella

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